Most people go with Suppa. It's just generally the most useful earring out there. My first job to 75 was PLD and I didn't bother with Knight's earring or Sattva ring. Bushinomimi for SAM (couldn't even wear it on SAM when I did DM) and Rajas as well.
I haven't played PLD for my LS in months, so maybe I'm a bit bias. I know a PLD who has both tank earring and ring from RotZ and CoP. Loves PLD and thats all he wants to be. Bless his soul for that. If you however will level something other then PLD (I.E. WAR or NIN or /NIN on anything) Suppa would most likely be a better choice for you.
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